wie viel gene hat der mensch — can a DNA test help?

The number of genes in the human genome is estimated at about 20,000 to 25,000 protein-coding genes, though the exact count remains debated due to non-coding RNAs, pseudogenes, and regulatory elements. Current reference genomes (e.g., GENCODE) list around 19,000–20,000 protein-coding genes, but the total functional units are higher. A commercial DNA test, such as those from MyBody-X or other providers, cannot determine this number. These tests analyze specific single nucleotide variants (SNPs) in selected genes to generate risk profiles for certain traits or diseases. The question 'How many genes does a human have?' is a fundamental scientific question answered by genome sequencing projects—not by a SNP chip. Therefore, a DNA test cannot help in determining the gene count. It can provide hints about genetic predispositions, but the evidence is often weak (e.g., GWAS with small effect sizes). The utility is limited, and many claims are marketing-driven. For the pure knowledge question of gene number, a DNA test is not helpful.